He didn't claim they were superior. He said they deviate more from the mean, in both directions.

For example, there are a lot more boys than girls who struggle with basic reading comprehension. Sound familiar?

There's a lot of evidence that not having two X chromosomes is less stable, leading to...irregularities. That sword cuts both ways.

I don't like ignorance being promoted under the cloak of not causing offense. It causes more harm than good. If there's a societal problem, you can't tackle it without knowing the actual cause. Sometimes the issue isn't an actual problem caused an 'ism,' it's just biology, and it's a complete waste of resources trying to change it.